Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 0), (0, -1, 1), (0, 0, -1), (1, 1, 0)}.
A149258
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 0), (0, -1, 1), (0, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =39a(5) =141a(6) =531a(7) =2055a(8) =8184a(9) =33072a(10) =135841a(11) =564960a(12) =2375302a(13) =10076779a(14) =43089130a(15) =185560423a(16) =804020555a(17) =3502720054a(18) =15334927573a(19) =67435970381a(20) =297735390506
External references
- oeis: A149258